85
Default
MAC address check for DHCP snooping is disabled.
Views
Layer 2 Ethernet interface/Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
With MAC address check enabled, DHCP snooping compares the
chaddr
field of a received DHCP
request with the source MAC address field in the frame header. If they are the same, DHCP
snooping considers this request valid and forwards it to the DHCP server. If they are not the same,
DHCP snooping discards the DHCP request.
Examples
# Enable MAC address check for DHCP snooping.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] dhcp snooping check mac-address
dhcp snooping check request-message
Use
dhcp snooping check request-message
to enable DHCP-REQUEST check for DHCP
snooping.
Use
undo dhcp snooping check request-message
to disable DHCP-REQUEST check for
DHCP snooping.
Syntax
dhcp snooping check request-message
undo dhcp snooping check request-message
Default
DHCP-REQUEST check for DHCP snooping is disabled.
Views
Layer 2 Ethernet interface/Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
DHCP-REQUEST packets include lease renewal packets, DHCP-DECLINE packets, and
DHCP-RELEASE packets. This feature prevents unauthorized clients that forge DHCP-REQUEST
packets from attacking the DHCP server.
With this feature enabled, DHCP snooping looks for a matching DHCP snooping entry for each
received DHCP-REQUEST message.
•
If a match is found, DHCP snooping compares the entry with the message. If they have
consistent information, DHCP snooping considers the packet valid and forwards it to the DHCP
server. If they have different information, DHCP snooping considers the message invalid and
discards it.
•
If no match is found, DHCP snooping forwards the message to the DHCP server.
Содержание SOHO IE4300
Страница 114: ...ii tftp client ipv6 source 41 tftp client source 41 tftp ipv6 42 tftp server acl 44 tftp server ipv6 acl 44...
Страница 285: ...i Contents Tcl commands 1 cli 1 tclquit 1 tclsh 2...
Страница 288: ...i Contents Python commands 1 exit 1 python 1 python filename 2...
Страница 291: ...i Contents Automatic configuration commands 1 autodeploy udisk enable 1...
Страница 323: ...25 Sysname Ten GigabitEthernet1 0 51 undo shutdown Related commands irf port...
Страница 396: ...i Contents Bulk interface configuration commands 1 display interface range 1 interface range 1 interface range name 3...
Страница 460: ...i Contents Port isolation commands 1 display port isolate group 1 port isolate enable 2 port isolate group 2...
Страница 465: ...ii stp vlan enable 55 vlan mapping modulo 55...
Страница 589: ...60 Examples Enable LLDP for automatic IP phone discovery Sysname system view Sysname voice vlan track lldp...
Страница 602: ...12 Related commands display mvrp statistics...
Страница 609: ...i Contents VLAN mapping commands 1 display vlan mapping 1 vlan mapping 2...
Страница 678: ...9 Related commands reset pppoe relay statistics...
Страница 846: ...i Contents Basic IP forwarding commands 1 display fib 1 ip forwarding table save 2...
Страница 1073: ...i Contents HTTP redirect commands 1 http redirect https port 1 http redirect ssl server policy 1...
Страница 1087: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1340: ...9 Sysname ipv6 route static default preference 120 Related commands display ipv6 routing table protocol...
Страница 1649: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1668: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 1770: ...i Contents Time range commands 1 display time range 1 time range 1...
Страница 2026: ...34 Related commands display mac authentication...
Страница 2028: ...ii...
Страница 2143: ...i Contents User profile commands 1 display user profile 1 user profile 2...
Страница 2308: ...61 ipsec transform set...
Страница 2473: ...i Contents TCP attack prevention commands 1 tcp anti naptha enable 1 tcp check state interval 1 tcp state 2...
Страница 2531: ...i Contents SAVI commands 1 ipv6 savi down delay 1 ipv6 savi log enable 1 ipv6 savi strict 2...
Страница 2534: ...3 Sysname ipv6 savi strict Related commands ipv6 verify source...
Страница 2541: ...i Contents Crypto engine commands 1 display crypto engine 1 display crypto engine statistics 1 reset crypto engine statistics 3...
Страница 2545: ...i Contents FIPS commands 1 display crypto version 1 display fips status 1 fips mode enable 2 fips self test 4...
Страница 2791: ...14 Sysname track 1 Related commands delay display track...
Страница 2939: ...9 sntp authentication keyid sntp reliable authentication keyid...
Страница 2967: ...27 Related commands apply poe profile poe enable poe max power interface view poe priority...
Страница 3240: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...
Страница 3263: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments...